/Engine/Source/Runtime/Engine/Classes/Camera/CameraModularFeature.h
The implementation should just add its modifier classes to the provided array, leaving any previously gathered modifiers from other modular feature implementers.
void GetDefaultModifiers ( [TArray](API\Runtime\Core\Containers\TArray)< [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< [UCameraModifier](API\Runtime\Engine\Camera\UCameraModifier) >> & ModifierClasses ) const